Electro-Voice T221M - Manual

T221M

Biampable, Compact,

Two-Way Floor Monitor

Speaker System

• Constant-directivity 80° x 55° horn

with 2-inch titanium driver

• High-output, 400-watt, 12-inch woofer

• Biamped or full-range operation-

simple biamp instructions included

inside the enclosure

• Rock-solid enclosure made with

12-ply curved plywood shell

• PRO

TM

circuit provides HF driver

protection

• Professional Neutrik Speakon

®

connectors for biamp or full-range

operation

Description

The Electro-Voice T221M is a 400-watt, two-

way, high-efficiency floor monitor system. It

combines professional-quality components,

highlighted by the DH2T compression driver

and 400-watt, high-output 12-inch woofer.

The system may be biamplified or used full

range with the internal passive crossover.

Either way, the result is clear and articulate,

high-quality sound.

The enclosure is constructed of a void-free

3/4-in. 12-ply curved plywood shell which

is extremely rigid. The baffle and end pieces

are made from 13-ply birch plywood. This

high-strength enclosure is sprayed with a

resilient, textured black finish for a truly pro-

fessional appearance. The end-mounted,

heavy-duty, recessed handle makes trans-

portation easy and three rubber feet on the

opposite end help keep the finish looking

new.

The high-frequency section of the T221M

utilizes a compact 80° x 55° constant-direc-

tivity horn driven by a wide-bandwidth, two-

inch-titanium-diaphragm driver. The voice

coil is coupled to the diaphragm with EV’s

exclusive Resonant Drive

TM

technology. This

increases and smooths the high-frequency

response and reduces the amount of internal

equalization required for flat frequency re-

sponse.

EV’s self-resetting PRO

TM

circuit is built into

the crossover network to guard the compres-

sion driver from damage. If input power to

the driver exceeds the nominal rating, the

PRO

TM

circuit is activated, reducing the

power delivered to the driver by 6 dB. The

system will remain in this mode of opera-

tion until input power is reduced to a safe

level.

The optimally vented bass section of the

T221M is designed using Thiele-Small pa-

rameters for efficient performance to below

100 Hz. The high-output 12-inch woofer

delivers outstanding performance. It features

beryllium copper lead wires with a low-mass,

edge-wound voice coil and high-temperature

materials. The coil is driven by a massive,

15-lb magnetic structure.

Frequency Response

The combination of a 12-inch woofer, DH2T

wide-bandwidth high-frequency driver and an

equalized crossover results in the wide and

smooth overall response shown in Figure 2.

The T221M’s axial frequency response was

measured in Electro-Voice’s large anechoic

chamber at a distance of 10 feet with a swept

sine-wave input of 4 volts. Figure 2 has been

averaged and corrected for 1 watt/1 meter,

half-space operation.

Directivity

The polar response of the T221M speaker

system at selected one-third-octave band-

widths is shown in Figure 1. These polar

responses were measured in an anechoic

environment at 20 feet using one-third-oc-

tave pink-noise inputs. The frequencies

selected are fully representative of the polar

response of the system. Beamwidth of the

system utilizing the complete one-third-oc-

tave polar data is shown in Figure 1. R

θ

and

directivity index (D

i

) are plotted in Figure 4.

Biamping

The T221M may be easily converted for

biamp operation. To do this, first carefully

remove the crossover. Notice the instruc-

tions on the circuit board and the four-wire

“Molex” connector. The T221M comes from

the factory in passive (full-range) mode. To

convert the T221M to biamp operation, un-

plug the “Molex” connector from the header

m a r k e d “ PA S S I V E M O D E ( F U L L

RANGE”) and plug it into the header labeled